gav" i know how plane engines work" the spotter, anybody is welcome on these forums, no laws against it.
My knowledge is limited, I only have 32 years experience in aviation maintenance, and I don't pretend to know it all as that would be dangerous, and I don't pretent to know what Landroger is talking about, but I would respect his knowledge in his field.
There are ways to ask questions and to take that information to learn from it, unfortunately the abrupt and agressive attitude that is shown by some posters doesn't do them any favours. I'll help anybody glean knowledge I don't have a problem with that, that's how we all learn, and if I don't know something I will ask that's how I learn.
I could show you some pics taken during a borescope inspection (you know what that is don't you?) the other day from a CF6-80 as fitted to a 747-400 after a suspected ingestion of something, we also had to replace the oil system scavenge filter and drain, flush and replace the engine oil, I wasn't sure what was ingested by the engines, but made the call to ground the a/c and carry out the necessary checks, really pissing off the 450 pax that had been waiting for 4 days to fly, but hey what do I know.
By the way the check is the same if ingestion is volcanic ash or sand, so prey tell why do I have to drop the engine oil and filters on a gas turbine engine as fitted to the 744?